Yes, synechdote was my first thought - but I wonder if metonymy isn't nearer? Using the name of an object or attribute to signify something greater - e.g. "the Crown" when you are speking of the sovereign. "The Greek Navy could muster nearly 200 sail" meaning they had getting on for 200 ships. etc. etc.

Disclaimer: Wordsmith.org is not responsible for views expressed on this site.
Use of this forum is at your own risk and liability - you agree to
hold Wordsmith.org and its associates harmless as a condition of using it.